/ ˌbaɪˈlɪŋgwəl; NAmE / adjective
1.
able to speak two languages equally well because you have used them since you were very young :
She is bilingual in English and Punjabi.
2.
using two languages; written in two languages :
bilingual education / communities
a bilingual dictionary
► bi·lin·gual noun :
Welsh / English bilinguals
—compare monolingual , multilingual
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WORD ORIGIN
mid 19th cent.: from Latin bilinguis , from bi- having two + lingua tongue + -al .